168721076 has 6 divisors (see below), whose sum is σ = 295261890. Its totient is φ = 84360536.

The previous prime is 168721067. The next prime is 168721079. The reversal of 168721076 is 670127861.

168721076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 161290000 + 7431076 = 12700^2 + 2726^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168721079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21090131 + ... + 21090138.

It is an arithmetic number, because the mean of its divisors is an integer number (49210315).

Almost surely, 2^168721076 is an apocalyptic number.

It is an amenable number.

168721076 is a deficient number, since it is larger than the sum of its proper divisors (126540814).

168721076 is a wasteful number, since it uses less digits than its factorization.

168721076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42180273 (or 42180271 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 168721076 is about 12989.2677237787. The cubic root of 168721076 is about 552.5731505692.

The spelling of 168721076 in words is "one hundred sixty-eight million, seven hundred twenty-one thousand, seventy-six".